When I left Tess’s house after Book Club, the snow and streetlights created a dramatic winter scene. She pointed out the giant icicles on the neighboring house. Walked to the corner and took a shot but just not enough light to make them interesting. A car came down the hill. I was able to catch some of the light from their low beams as they backlit the giant icicles that almost touched the ground.( Well, the deep snow covering the ground). The term chiaroscuro surfaces as I look at the shading now, the darkness, the light. An article about the use of it in photography Lighting is All About Chiaroscuro explains what I was trying to achieve with the use of available light. The car’s lights timing saved the shot.